wifi: mac80211: take wiphy lock for MAC addr change

[ Upstream commit a26787a ]

We want to ensure everything holds the wiphy lock,
so also extend that to the MAC change callback.

Signed-off-by: Johannes Berg <[email protected]>
Stable-dep-of: 74a7c93 ("wifi: mac80211: fix change_address deadlock during unregister")
Signed-off-by: Sasha Levin <[email protected]>

Author: jmberg-intel

net/mac80211/iface.c

@@ -251,9 +251,9 @@ static int ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data *sdata
 	return ret;
 }
 
-static int ieee80211_change_mac(struct net_device *dev, void *addr)
+static int _ieee80211_change_mac(struct ieee80211_sub_if_data *sdata,
+				 void *addr)
 {
-	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 	struct ieee80211_local *local = sdata->local;
 	struct sockaddr *sa = addr;
 	bool check_dup = true;
@@ -278,7 +278,7 @@ static int ieee80211_change_mac(struct net_device *dev, void *addr)
 
 	if (live)
 		drv_remove_interface(local, sdata);
-	ret = eth_mac_addr(dev, sa);
+	ret = eth_mac_addr(sdata->dev, sa);
 
 	if (ret == 0) {
 		memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
@@ -294,6 +294,19 @@ static int ieee80211_change_mac(struct net_device *dev, void *addr)
 	return ret;
 }
 
+static int ieee80211_change_mac(struct net_device *dev, void *addr)
+{
+	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+	struct ieee80211_local *local = sdata->local;
+	int ret;
+
+	wiphy_lock(local->hw.wiphy);
+	ret = _ieee80211_change_mac(sdata, addr);
+	wiphy_unlock(local->hw.wiphy);
+
+	return ret;
+}
+
 static inline int identical_mac_addr_allowed(int type1, int type2)
 {
 	return type1 == NL80211_IFTYPE_MONITOR ||